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USER MANUAL XDM503 JL Audio
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Front view of a black industrial fan or vent with ventilation grilles and a logo (no visible text or symbols)XDM500/3
500W 3-CHANNEL AMPLIFIER
OWNER'S MANUAL MANUEL D'UTILISATION MANUAL DEL PROPIETARIO BEDIENUNGSANLEITUNG MANUALE DEL PROPRIETARIO

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x1 2.5 mm x1 x1
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Technical line drawing of a portable electronic device chassis with ports and connectors (no text or symbols)
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0.50 in (12 mm) 0.50 in (12 mm)INSTALLATION CONSIDERATIONS
• Installation requires appropriate tools and safety equipment. Professional installation is recommended.
• This product is water-resistant. Do not submerge or subject to high-pressure water spray.
- Before installation, turn off the audio system and disconnect the battery system from the audio system.
- When possible, install in a dry, well-ventilated location that does not interfere with factory-installed systems. If a dry environment is not available, a location that is not exposed to heavy splashing may be used.
- Do not install in the engine compartment, any areas of extreme heat or where it will be directly exposed to the elements.
- Before cutting or drilling, check for potential obstacles behind mounting surfaces.
- Carefully route all system wiring away moving parts and sharp edges; secure with cable ties or wire clamps and use grommets and loom where appropriate to protect from sharp edges.
SAFETY CONSIDERATIONS
- Only use this product with 12 volt, negative-ground electrical systems. This product is not certified or approved for use in aircraft.
- Mount this product securely to prevent damage or injury in severe conditions.
- An appropriate fuse (or circuit breaker) at the main power wire is vital for vehicle/vessel safety and must be installed within 18 inches (45 cm) of the positive battery connection.
- For ABYC and NMEA applications, circuit protection is required within 7 inches (18 cm) of the battery, unless the cable is in an enclosure or conduit.
- Listen to your audio system at levels appropriate for operating conditions and hearing safety.
CONNECTIONS

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1 XOMEX3| Connection Description Notes | ||||
| 1 | +12 VDC Positive (+12V) Power Connection | • 4 AWG wire (required)• Install 50A fuse at (+) battery post | ||
| Ground Negative (GND) Ground Connection • 4 AWG wire (required) | ||||
| Remote Positive (+12V) Activation Connection | • 18 - 12 AWG wire capacity• See Open On Mode for more info | |||
| 2 | CH. 1 Input Left Input Signal, Black RCA | • Accepts 200mV - 4V input voltage• See Output Mode for more info | ||
| CH. 2 Input Right Input Signal, Red RCA | ||||
| SUB CH. Input Left Subwoofer Input Signal, Black RCA | ||||
| SUB CH. Input Right Subwoofer Input Signal, Red RCA | ||||
| Preout 1 Left Pass-Through Preamp Signal, Black RCA | • See Pouts From for more info | |||
| Preout 2 Right Pass-Through Preamp Signal, Red RCA | ||||
| 3 | Remote Level Control | Remote Level Controller Connection (optional)(HD-RLC or WHO-RLC) | • Operates as an attenuator only:Fully counter-clockwise = Level MutedFully clockwise = Level Unaffected | |
| 4 | CH. 1 (L)SpeakerOutput | ⊕ | (+) Positive Speaker Output CH. 1&2 Bridged (+) | • Minimum impedance load:Stereo mode ≥2 ohmsBridged mode ≥4 ohms• 16 - 8 AWG wire capacity |
| ⊖ | (-) Negative Speaker Output | |||
| CH. 2 (R)SpeakerOutput | ⊕ | (+) Positive Speaker Output | ||
| ⊖ | (-) Negative Speaker Output CH. 1&2 Bridged (-) | |||
| 5 | MonoSubwooferOutput | ⊕ | (+) Positive Subwoofer Output | • Both positive (-) connections are connected in parallel internally• Both negative (-) connections are connected in parallel internally• Minimum impedance load: ±2 ohms• 16 - 8 AWG wire capacity |
| ⊕ | (+) Positive Subwoofer Output | |||
| ⊖ | (-) Negative Subwoofer Output | |||
CONTROLS

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JL AUDIO XOM5003 7 12/05/2014 12/05/2014 12/05/2014 12/05/2014 12/05/2014 12/05/2014 12/05/2014 12/05/2014 12/05/2014 12/05/2014| Control (Function) Setting Description | |||
| 6 | Status LED(indicates operating status) | Flashing Green | Amplifier Powering Up, Audio Output Muted |
| Green On | Normal Operation, Active Audio Output | ||
| Red | On-Safe Mode, Over-Temperature Condition, Audio Output ReducedReverts to normal operation when temperature returns to a safe level | ||
| Amber (yellow) | On-Safe Mode, Over Current Condition, Audio Output MutedMay exhibit repetitive, audible ticking or thumping noise in the outputInspect for speaker/wire short circuit or low impedance | ||
| LEDs Off | Amplifier Turns Off (unexpectedly), Low-Voltage ConditionOccurs when battery or remote turn-on voltage drops below 10VReverts to normal operation when voltage rises above 11V | ||
| 7 | Turn On Mode(configures activation method) | Remote | +12V Remote Turn-On (Preferred)Controlled by a switched +12V circuit or turn-on output of your source unit/OFM interface |
| Offset | DC Offset Sensing (Automatic)Turns On by detecting the presence of small DC signal in OEM audio outputs and turns Off after the signal is removed | ||
| Signal | Signal Sensing (Automatic)Turns On by detecting full-range OEM audio signals and turns OFF after the signal is removed(within 30 seconds) | ||
| Input Filter(configures input filter application) | Car Select for most installations (automotive or marine) | ||
| Boat Select if experiencing interference from high current mechanical switches/devices | |||
| Input Mode(configures input signal connections) | 2 Ch. | Select when using CH. 1&2 inputs onlySUB CH. signal will be the sum of CH. 1&2 signals | |
| 4 Ch. | Select when using all four inputsSUB CH. signal will be the sum of both left and right SUB CH. inputsIf only one subwoofer channel signal is available, a Y adaptor is recommended to feed both SUB CH. inputs. | ||
| Remote Level Mode(configures HD-RLC operation - optional) | All Adjusts level of all channels equally | ||
| Sub Adjusts level of subwoofer channel only | |||
| Preouts From(configures preamp output signals) | 1&2 Same signal that is connected to CH. 1&2 inputs | ||
| Sub Same signal that is connected to the subwoofer channel inputs | |||
| Sum Summed signal, combining CH. 1&2 and subwoofer channel inputs into a stereo signal pair | |||
CONTROLS

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JL AUDIO XOMMOSOIS 1-20-05-2017/1986 Power Input Response Box 3.0 Input Mode Input Alt Output Alt Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs Control knobs| Control (Function) Setting Description | ||||
| 8 | Input Sens.(adjusts each channel pair's input stage) | Variable | Use to match the source unit's output voltage with the inputs of each pair of amplifier channels. See Appendix A for detailed information. | |
| CH, 1&2 | HP Filter Mode configures the high-pass filter of CH, 1&2 | Off Filter defeated, passes full range of frequencies present at the Inputs | ||
| HP | Attenuates frequencies below the CH, 1&2 "Filter Freq. (Hz)" dial, at a rate of 12dB/octave | |||
| HP Filter Freq. (Hz)(adjusts the high-pass filter cutoff frequency) | Variable | Use to adjust the cutoff frequency of channel 1&2's high-pass active filter, from 50 Hz - 500 Hz / 12dB per octave | ||
| SUB CH | LP Filter Mode/Slope configures the low-pass filter and slope of SUB CH | Off Filter defeated, passes full range of frequencies present at the inputs | ||
| 12dB | Attenuates frequencies above the SUB CH. "LP Filter Freq. (Hz)" dial, at a rate of 12dB/octave | |||
| 24dB | Attenuates frequencies above the SUB CH. "LP Filter Freq. (Hz)" dial, at a rate of 24dB/octave | |||
| LP Filter Freq. (Hz)(adjusts the low-pass filter cutoff frequency) | Variable | Use to adjust the cutoff frequency of the subwoofer channel's low-pass active filter, from 50 Hz - 500 Hz / 12dB per octave | ||
APPENDIX A:
Input Sensitivity Level Setting
Follow the steps below to adjust the input sensitivity of each amplifier
channel pair to achieve overall system balance.
Necessary Equipment
| • Digital AC Voltmeter |
| • Sine-wave test tone recorded at 0 dBfs reference level in the frequency range to be amplified.Do not use attenuated test tones (-10 dB, -20 dB, etc.).Full range channel/amplifier applications: 1 kHzSubwoofer channel/amplifier applications: 50 Hz |
| • Depending on your type of source unit, the sine-wave may be played via a CD, USB thumb drive, portable media player or Bluetooth® audio source. Make sure to disable any EQ/DSP modes on your portable media player during level setting. |
The Nine-Step Procedure
| 1. Disconnect the speaker(s) from the amplifier's speaker output connectors. |
| 2. Turn off all processing (bass/treble, loudness, EQ, etc.) on the source unit, processors (if used), and amplifier. Set the fader control to center position and the subwoofer level control to 3/4 of maximum, if used. |
| 3. Turn all "Input Sens." controls all the way down. |
| 4. Set the source unit volume to 3/4 of full volume. This will allow for reasonable gain overlap with moderate clipping at full volume. |
| 5. Using the chart below, determine the target voltage for input sensitivity adjustment according to the nominal impedance of the speaker system connected to the amplifier outputs. |
| 6. Verify that you have disconnected the speakers before proceeding. Play a track with an appropriate sine wave (within the frequency range to be amplified) at 3/4 source unit volume. |
| 7. Connect the AC voltmeter to the speaker output terminals of the amplifier. If the channel pair is operating in stereo, it is only necessary to measure one channel. If bridged, make sure you test the voltage at the correct terminals (L+ and R-). |
| 8. Increase the "Input Sens." control until the target voltage is observed with the voltmeter. |
| 9. Once you have adjusted each channel section to its maximum low-distortion output level, reconnect the speaker(s). The "Input Sens." controls can now be adjusted downward if the amplifier requires attenuation to achieve the desired system balance. |
IMPORTANT!
| Do not increase any "Input Sens." setting for any amplifier channel or channel pair in the system beyond the maximum level established during this procedure. Doing so will result in audible distortion and possible speaker damage. |
| It will be necessary to re-adjust the "Input Sens." if any equalizer boost is activated after setting the "Input Sens." with this procedure. This applies to any EQ boost circuit, including source unit tone controls or EQ circuits. EQ cuts will not require re-adjustment. |
| Nominal Impedance | Target AC Voltage | ||
| CH 1&2 (Stereo) CH 1&2 | (Bridged) Subwoofer CH | ||
| 8Ω 17.3 V | 24.6V 76.8 V | ||
| 4Ω 17.3 V | 78.2V 76.8 V | ||
| 3Ω | 16.2 V | not recommended | 26.8 V |
| 2Ω | 14.1 V | not recommended | 24.5 V |
SPECIFICATIONS
| Amplifier Section | |||
| Amplifier Topology % NexDTM Ultra-High Speed Class D | |||
| Power Supply Type Unregulated MOSFET Switching | |||
| Minimum Copper Power/GND Wire | 4 AWG (Note: CCA/Copper Clad Aluminum wire is not recommended.) | ||
| Recommended Fuse 50 A | |||
| Rated RMS Power @ 14.4V, <1% THD+N | Main @ 4 Ω75W x 2 | Main @ 2 Ω100W x 2 | Main @ 4 Ω Bridged200W x 1 |
| Sub @ 4 Ω180W x 1 | Sub @ 3 Ω240W x 1 | Sub @ 2 Ω300W x 1 | |
| Rated RMS Power @ 12.5V, <1% THD+N | Main @ 4 Ω60W x 2 | Main @ 2 Ω90W x 2 | Main @ 4 Ω Bridged180W x 1 |
| Sub @ 4 Ω180W x 1 | Sub @ 3 Ω240W x 1 | Sub @ 2 Ω300W x 1 | |
| Frequency Response | Main Channels: 12 Hz - 22 kHz (+0, -1dB) Sub Channel: 10 Hz - 1 kHz (+0, -1dB) | ||
| S/N Ratio (A-weighted, 20 Hz-20 kHz noise bandwidth) | Main Channels: >104 dB (Referred to rated power),>84 dB (Referred to 1W) Sub Channel: >103 dB (Referred to rated power),>83 dB (Referred to 1 W) | ||
| Damping Factor | Main Channels: >150 / 50 Hz @ 4 Ω, >75 / 50 Hz @ 2 Ω Sub Channel: >120 / 50 Hz @ 4 Ω, >60 / 50 Hz @ 2 Ω | ||
| Input Section | |||
| Number of Inputs 4 (Two Stereo Pairs) | |||
| Input Type Differential-Balanced with RCA jack inputs | |||
| Input Voltage Range 200mV - 4V RMS | |||
| Signal Processing | |||
| Filter Type | CH. 1&2 SUB CH. | ||
| Active, 12dB/octave, High-Pass (50 - 500 Hz),defeatable | Active, 12dB or 24dB/octave, Low-Pass, (50 - 500 Hz),defeatable | ||
| Remote Level Control HD-RLC or MHD-RLC (optional). Full mute to 0 dB range. | |||
| Dimensions | |||
| L x W x H | 10.23 in. x 7.09 in. x 2.05 in. (260 mm x 180 mm x 52 mm) | ||